P11016: Intra-building Navigation

Shannon CarswellDan ParisTim Garvin

Dan Stanley

Outline

• Architecture and Process Diagrams• Bill Of Materials• Component Details• Interfaces• Software Information• Electrical Information• Test Plan• Risk Assessment• Feasibility Analysis

Architecture Diagram

RFID Reader RFID TAG

Microcontroller

Tag Number

INTERFACE(Computer)

Compass

Direction

I/O

Power Supply

Hand Held Device

Process Diagram

Map

Find Next Waypoint

Get current Location

Get Target Destination

(UI)

Translate to Location

UUID

BuildMap

There yet?

Tell User We’ve Arrived

(UI)

Give Directions (UI)

Manual Data Entry

UI Input

Tag UUID#

Tag UUID#

Yes

No

Bill of Materials

RFID ReaderSkyeTek M9 Module (MH)

– Frequency: 862-955MHz– Size: 70x53x9 (mm)– Weight: 12.5g– Read Range: 3.5m– Supply Voltage: 4.5-5.5V– Price: $274.00– Tag Compatibility: EPC Gen1 & EPC Gen2

RFID TagsALN-9654 “G” Inlay

•Size: 3.8”x0.9”

ALN-9634 “2x2” Inlay

•Size: 1.76”x1.76”

ALN-9662 “Short” Inlay

•Size: 2.76”x0.67”

ALN-9630 “Squiglette” Inlay

•Size: 2.76”x0.37”

ALN-9640 “Squiggle” Inlay

•Size: 3.73”x0.32”

RFID Antenna

ANT-VDP-DB1-RPS

• Frequency: 824-960MHz• VSWR: <1.5• Impedance: 50 ohms• Connector: SMA• Polarization: Linear• Size: 4”x0.8”x0.18”• Cost: Free

RFID Component Connection

Dev Board:Explorer 18

•Maximum Flexibility

•Debugging Support

•Too large to strap to arm.

•Enables confidence in later PCB

•Comes with Superset representative of the PIC18 family.

Microcontroller

PIC18F8722Microcontroller

Compass RFID Reader

Keypad Tactile Response Etc.

I2C

GPIO & PWM

Microcontroller Interfaces

Microcontroller:PIC18F8722

• “Head of the Family”

• 5 PWM Outputs

• I2C

• Aggressively Low Power

• Supports 5V Rail, down to 2V

Microcontroller Pin-out

Compass

• Freescale – MAG3110 3 Axis Magnetometer• Low Power Draw 24uA at 0.95-3.6V• Popular Consumer Electronics I2C Compatible Interface• Miniature Size 2x2x0.8mm• Maximum Measurement Frequency of 400Hz

Microcontroller and Compass Interface

• Both MC & Compass Support the Popular I2C Interface

I2C Interface• 2 Wire Interface for Low Speed Consumer Electronics• Commonly Used to Attach Peripherals Components to Motherboard• Ideal for the Low Speed ADC on the MAG3110 Chip

Navigation

• ‘Hybrid’ Algorithm– Graph Traversal– Area Navigation

• Terminology– Tag– Area– Waypoint

B

A

C

Navigation

• ‘Hybrid’ Algorithm– Graph Traversal– Area Navigation

• Terminology– Tag– Area– Waypoint

B

A

C

Power Supply Circuitry

V 19 V d c

C 1. 3 3 u

C 21 u

R 11 M e g

R 21 M e g

U 1L M 7 8 0 5 C

I N1

O U T2

GN

D3

U 2 A

TL C 2 7 7 / 1 0 1 / TI

+3

-2

V+

8

V -4

O U T1

00

V 1

V 2

V 1V

V

Power Supply Simulation

V1: 4.986 V

V2: 2.498V

Time

0s 0.1us 0.2us 0.3us 0.4us 0.5us 0.6us 0.7us 0.8us 0.9us 1.0usV(V1) V(V2)

2.4V

2.8V

3.2V

3.6V

4.0V

4.4V

4.8V

5.2V

(214.783n,2.4984)

(323.478n,4.9967)

Electrical Circuit for Compass

Test Plan

Objective:

Verify communication between all components in RFID System

• Reader vs. Antenna• Reader vs. Tags• Read Range vs. Tags• Reader vs. Micro• Compass vs. Micro• Power supply vs. RFID

system• Computer vs. Micro

Risk Assessment Changes

Feasibility Analysis

Dead Zone Solution

Future Plans

• MSD I– RFID Testing/ Feasibility Analysis– Read RFID Tag UID– Figure Out Wiring– PCB/Vector Board Considerations